英语中，年轻的国王可以用 "young king" 来表示。例如：
"The young king was only 20 years old when he ascended to the throne." (这位年轻的国王登上宝座时只有 20 岁。)
如果你想强调国王的年轻年龄，也可以使用 "young" 来修饰 "king"，例如：
"The young king was popular among the people because of his kind and fair rule." (这位年轻的国王因为仁慈公正的统治而受到人民的喜爱。)
希望这能帮到你！
"The young king was only 20 years old when he ascended to the throne." (这位年轻的国王登上宝座时只有 20 岁。)
如果你想强调国王的年轻年龄，也可以使用 "young" 来修饰 "king"，例如：
"The young king was popular among the people because of his kind and fair rule." (这位年轻的国王因为仁慈公正的统治而受到人民的喜爱。)
希望这能帮到你！